Overdose of calcium may cause damage to the kidneys, due to excessive calcium excretion, can cause polyuria, increased nocturia, irritable thirst, and even kidney stones adverse consequences, so calcium supplementation is not a good thing. Long-term oversupplementation of calcium can also cause constipation, may cause hypercalcemia, causing nausea, vomiting, abdominal pain, fatigue, leading to ectopic calcification, causing cardiovascular disease. The best way to supplement calcium is through food supplementation, eating calcium-rich dairy products, lean meat, and like fresh vegetables and fruits. Under the guidance of the doctor to choose the right kind of calcium supplements and dosage for us, and during the treatment period to regularly carry out the evaluation of the efficacy and safety of the use of calcium supplements, in particular, regularly check the 24-hour urine calcium, blood calcium and blood phosphorus, to ensure the effectiveness and safety of the treatment.